Iowa Rep. Steve King has one question for Georgia Rep. John Lewis: What have you done for us lately?

Lewis told an Iowa radio station, "I have long contemplated just going to the floor and saying, 'John Lewis, thank you for your contribution to civil rights during the civil rights era. I would appreciate if you'd contribute something since then. It's been a half a century.'"

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Rep. John Lewis

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Rep. John Lewis

U.S. Rep. John Lewis of Georgia, a civil-rights icon, who was lambasted over the weekend by President-elect Donald Trump after Lewis questioned the legitimacy of Trump's election, speaks at the 5000 Role Models of Excellence breakfast at Jungle Island on Martin Luther King Jr. Day, Jan. 16, 2017 in Miami. (Emily Michot/Miami Herald/TNS via Getty Images)

WASHINGTON, DC - JANUARY 11: Representative John Lewis (D-GA) takes part in panel testimony during the second day of the United States Attorney General confirmation hearing for Senator Jeff Sessions (R-AL) at the Russell Senate Office Building on Wednesday January 11, 2017 in Washington, DC. (Photo by Matt McClain/The Washington Post via Getty Images)

WASHINGTON, DC - JANUARY 11: Representative John Lewis (D-GA), center, speaks as Senator Cory Booker (D-NJ), left, and Representative Cedric Richmond (D-LA) look on as they take part in panel testimony during the second day of the United States Attorney General confirmation hearing for Senator Jeff Sessions (R-AL) at the Russell Senate Office Building on Wednesday January 11, 2017 in Washington, DC. (Photo by Matt McClain/The Washington Post via Getty Images)

Representative John Lewis, a Democrat from Georgia, speaks during a Senate Judiciary Committee confirmation hearing for Senator Jeff Sessions, a Republican from Alabama and attorney general nominee for U.S. President-elect Donald Trump, not pictured, in Washington, D.C. U.S., on Wednesday, Jan. 11, 2017. Senator Cory Booker broke with tradition today and became the fist-sitting senator testify against a fellow senators nomination for a Cabinet post. Photographer: Andrew Harrer/Bloomberg via Getty Images

PHILADELPHIA, PA - SEPTEMBER 19: Civil Rights icon Rep. John Lewis (GA-05) receives the the 2016 Liberty Medal from Jeffrey Rosen (left), President and CEO of the National Constitution Center Monday, September 19, 2016 in Philadelphia, Pennsylvania. According to the National Constitution Center, the Liberty Medal honors men and women of courage and conviction who strive to secure the blessings of liberty to people around the globe. (Photo by William Thomas Cain/Getty Images)

PHILADELPHIA, PA - SEPTEMBER 19: Civil Rights icon Rep. John Lewis (GA-05) receives the the 2016 Liberty Medal from Jeffrey Rosen (left), President and CEO of the National Constitution Center Monday, September 19, 2016 in Philadelphia, Pennsylvania. According to the National Constitution Center, the Liberty Medal honors men and women of courage and conviction who strive to secure the blessings of liberty to people around the globe. (Photo by William Thomas Cain/Getty Images)

Representative John Lewis, a Democrat from Georgia, from left, speaks while standing next to Representative Joseph 'Joe' Crowley, a Democrat from New York, House Minority Leader Nancy Pelosi, a Democrat from California, and Representative Charles 'Charlie' Rangel, a Democrat from New York, outside the U.S. Capitol in Washington, D.C., U.S., on Thursday, June 23, 2016. Democrats closed out a marathon sit-in on the U.S. House floor Thursday afternoon after 25 hours of emotionally charged speeches demanding action on gun control, but they insisted their protests would continue in other forms. Photographer: Andrew Harrer/Bloomberg via Getty Images

ATLANTA, GA - JUNE 19: United States Congressman John Lewis is honored before the game between the New York Mets and the Atlanta Braves at Turner Field on June 19, 2015 in Atlanta, Georgia. (Photo by Mike Zarrilli/Getty Images)

US Representative John Lewis, Democrat of Georgia and one of the original Selma marchers, speaks during an event marking the 50th Anniversary of the Selma to Montgomery civil rights marches at the Edmund Pettus Bridge in Selma, Alabama, on March 7, 2015. US President Barack Obama rallied a new generation of Americans to the spirit of the civil rights struggle, warning their march for freedom 'is not yet finished.' In a forceful speech in Selma, Alabama on the 50th anniversary of the brutal repression of a peaceful protest, America's first black president denounced new attempts to restrict voting rights. AFP PHOTO/ SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

(L-R) Former First Lady Laura Bush, First Lady Michelle Obama, US President Barack Obama and US Representative John Lewis, Democrat of Georgia, holds hands during an event marking the 50th Anniversary of the Selma to Montgomery civil rights marches at the Edmund Pettus Bridge in Selma, Alabama, March 7, 2015. US President Barack Obama rallied a new generation of Americans to the spirit of the civil rights struggle, warning their march for freedom 'is not yet finished.' In a forceful speech in Selma, Alabama on the 50th anniversary of the brutal repression of a peaceful protest, America's first black president denounced new attempts to restrict voting rights. AFP PHOTO/ SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

(L-R) US President Barack Obama holds hands with US Representative John Lewis, Democrat of Georgia, alongside former US President George W. Bush during an event marking the 50th Anniversary of the Selma to Montgomery civil rights marches at the Edmund Pettus Bridge in Selma, Alabama, March 7, 2015. US President Barack Obama rallied a new generation of Americans to the spirit of the civil rights struggle, warning their march for freedom 'is not yet finished.' In a forceful speech in Selma, Alabama on the 50th anniversary of the brutal repression of a peaceful protest, America's first black president denounced new attempts to restrict voting rights. AFP PHOTO/ SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

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King was also critical of the Congressional Black Caucus, saying, "When they formed the Congressional Black Caucus back years ago, in the aftermath or in the beginning of the civil rights movement, the shape of that, I looked at that even then and I thought, 'How can you form a caucus that's established on race?' But they did, and they got away with it because people didn't want it challenged. And now, the Congressional Black Caucus, I just openly say they're the self-segregating caucus."

Lewis is an icon of the civil rights movement, famous for leading a 1965 march in Selma, Alabama, that ended in a brutal police crackdown.

More recently, Lewis sponsored the House version of a bill to re-investigate some unsolved racially motivated crimes committed before 1980. President Obama signed that bill into law in December.

King has something of a history of wading into racially charged issues.

During an interview on MSNBC, he asked, "Where are these contributions that have been made by these other categories of people that you're talking about? Where did any other subgroup of people contribute more to civilization?"